US Patent 7107689 Bar knob with integrated lock

A retaining assembly is provided for a tensioning arrangement for adjusting the tension of the cutting chain in the chainsaw. The retaining assembly includes a knob body, a lock, and a lever. The lock and lever rotate about a common axis, which is perpendicular to an axis of rotation of the retaining assembly. The lock includes a tooth adapted to engage with teeth on a clutch cover of a chainsaw to lock the retaining assembly in place.